var path = require('path');
var sha1 = require('sha1');

var express = require('express');
var router = express.Router();

var UserModel = require('../models/users');
var checkNotLogin = require('../middlewares/check').checkNotLogin;

/*GET /signup 注册页*/
router.get('/', checkNotLogin, function (req, res, next) {
    res.render('signup');
});

/*POST /signup 用户注册*/
router.post('/', checkNotLogin, function (req, res, next) {
    var name = req.fields.name;
    var gender = req.fields.gender;
    var bio = req.fields.bio;
    var avatar = req.files.avatar.path.split(path.sep).pop();
    var password = req.fields.password;
    var repassword = req.fields.repassword;

    /*校验参数*/
    try {
        if (!(name.length >= 1 && name.length <= 10)) {
            throw new Error('名字请限制在1-10字符');
        }
        if (['m', 'f', 'x'].indexOf(gender) === -1) {
            throw new Error('性别只能是 m 、f 或 x');
        }
        if (!(bio.length >= 1 && bio.length <= 30)) {
            throw new Error('个人简介请限制在 1-30 个字符');
        }
        if (!req.files.avatar.name) {
            throw new Error('缺少头像');
        }
        if (password.length < 6) {
            throw new Error('密码至少6字符');
        }
        if (password !== repassword) {
            throw new Error('两次输入密码不一致');
        }
    } catch (e) {
        req.flash('error', e.message);
        return res.redirect('/signup')
    }

    /*明文密码加密*/
    password = sha1(password);

    /*待写入数据库的数据*/
    var user = {
        name: name,
        password: password,
        gender: gender,
        bio: bio,
        avatar: avatar
    };

    UserModel.create(user)
        .then(function (result) {
            /*此user是插入mongodb后的值，包含_id*/
            user = result.ops[0];
            /*将用户信息存入session*/
            delete user.password;
            req.session.user = user;
            /*写入flash*/
            req.flash('success', '注册成功');
            /*跳转到首页*/
            res.redirect('/posts');
        })
        .catch(function (e) {
            /*用户名被占用则跳转到注册页，而不是错误页*/
            if (e.message.match('E11000 duplicate key')) {
                res.flash('error', '用户名已被占用');
                return res.redirect('/signup')
            }
            next(e);
        });
});

module.exports = router;